Motor-operated relay



Jan. 2, 1934. I c. WILHJELM 0 MOTOR OPERATED RELAY Filed July 22, 1930INVENTOR.

BY WM ATTORNEY.

' whatever it may be, to

Patent d-Jan. 2, .1934

Pusan OFFICE uo'ron' or'nasmn may Christian Wllhjelm, Philadelphia, 1a.,asaignor to Gustav H. Johnson, trustee Application July 22, 1930. SerialNo. 469,835

15 Claims. (01. 172-239) This invention relates to motor operatedrelays, and, particularly to relays operable auto matically to controlother circuits. in response to deviations of acondition-responsivecircuit maker. i

Automatic controlof pressure, light, humidity, temperature, etc.,characterized as of variable condition, in most cases depends on asensitive instrument pointer for setting in motion a number of othermore or less powerful devices, which, through mechanical operation insome way oranother makes the necessary correction,

maintain the desired conditions. I a

The most common method of actuating control devices from sensitiveinstrument pointers is to.

arrange one or more contacts in the necessary instrument so that theindicating pointer, or condition responsive device, as it changesposition in response to a change of condition, touches these contactsand thereby selects one of two or more different passages for anelectric circuit, which in turn must set the controlling machinery inaction until the changed conditions have been corrected-as'manifested bya return of the conditions to a predetermined normal condition. Howeverthe, amount of electric current that can usually be passedthroughsuchflimsy instrument contacts is very limited, so it nearly always becomesnecessary .to introduce one .or more stages of relays. -.The one stagebeing capable of carrying more current through its contacts than thenext previous stage in the series. Now, one of themain objects of thisinvention is to provide such an intermediate relay device betweenacontact instrument and the correcting control equipment, that althoughit only uses a very faint current for its operation, it can make andbreak large amounts ofelectric currentand operate electric motors ofseveral horsepower without any additional step-up relays.

Another'object is to provide a relay to operate from these flimsyinstrument contacts in such a manner that the flickering which is due tovibration of the instrument when mounted in a factory building does notpass the relay. Any ordinary solenoid operated relay naturally willcarry such flickering through the whole' control system and cause almostthe destruction of moving parts. Relays are now used which prevent thischattering by self locking features, but when used it becomes necessaryfor the controlling pointer to move far enough back to close anothercontact in order to make the locked relay fall out, and then close thecircuit that in turn .dition responsive. instruments. There are alsomakes corrections for variations in the opposite direction.- This methodmakes the control instrument complicated and at the same time lesssensitive for control as the required large distance between the twocontacts needed for each operation necessary, must be travelled by thepointer either way before any change in conditions can be effectedthrough the relays. Therefore, a further object of the invention. is toprovide a control relay that on the faintest closing 05 of theinstrument contact will operate the re--. quired correcting mechanismand which also, as soon as this contact is severed will react into someother position causing some other correcting mechanism to operate. Dueto the fact that 79 the current consumed by the relay operation is veryfaint, there is practically no sparking when the instrument contact isbroken, hence the faintest move of the'pointer from. the contact will,cause a desired change in the operation of the controlling. mechanism.

There are-many varied means of making the electric contacts in standardmeasuring or conmany difierent mechanical meansfor controllin 80 ;the'conditions-from such gauges or instruments. invention,therefcre,'primarily applies to an intermediate device wired in betweenthe sensitive control gauge and'the controlling means, therefore, in thedescription and accompanying drawing, I am describing the invention inorder to show how it can apply to the now commonly used contactinstruments and control means of the different types. The details hereshown, however, should by no means confine my invention, but merely showa few of its many applications. It might be noted in connection with thepast art in circuit controllers, that it has been attempted heretoforeto utilize a fully enclosed tube of glass, in which is embedded sets ofcontacts, arranged for selective circuit closing by contact with aglobule of mercury, as the tube is given a change in position, and inwhich as 190 many as three different circuits are established in thesame tube. This construction has never been completely successfuL-owingamong other factors to the danger of a residual trail of mercury lyingin the tube in such position as to 105 simultaneously energize twodifferent sets of contacts. It is an object of this invention to secureall of the benefits of such'multi'plecontact tube without thedisadvantages of prior constructions. 1

In the accompanying drawing, of this description,

Fig. 1 represents a diagrammatic perspective of one, purely illustrativeform of the invention,

Fig. 2 represents an end elevation of the circuit controlling elementactuated by the motor, showing the element in one extreme position,

Fig. 3 represents an end elevation of the circuit controlling elementactuated by the motor, showing the element in another extreme position,and

Fig. 4 represents an elevation of a modification of a portion of thecircuit controlling device actuated by the motor.

The actuating instrument for simplicity is only shown as a simplebi-metallic thermostat 1, responsive to temperature changes, but it willbe understood that this is purely illustrative, and any other conditionresponsive device or other circuit maker might equally well be used. Oneend of this thermostat is permanently fixed at 2, the other endforms themoving pointer 3 which will move right or left as the temperature orother condition to which the thermostat or responsive instrument isexposed changes up or down. In the drawing the movement of the pointer 3to the left means dropping temperature, a raising temperature will movethe pointer to the right; Two

contacts 4 and 5 are provided to engage the pointer 3 as it deviates,from'a certain temperature drop 3 engages 4, if the temperature raises,3 will engage 5.

The following parts are the essentials in a reversing self-startingalternating current motor which is now a standard generally knownarticle on the market. For illustrative and not-limitative purposesreference might be made to U. S. Patent No. 1,283,435 for a disclosureof a type of motor that might be usable herein when suitably modified tocomprise a reversing motor. There are numerous reversing motors, made bydifferent manufacturers, that will admirably fill the requirements ofthis invention, but for further disclosure of a reversing motor of thetype preferred with this invention, reference may be made to BulletinMI-3 of the Warren Telechron Company, Ashland, Massachusetts, publishedin 1930, and particularly to pages 8 and 11, type BX and CK,respectively. However, for this purpose any electric motor that canconveniently be reversed by sending current to it alternately throughone or the other of two wires can be used. The motor has a field winding6 on an iron core 8 tending to force the motor counter clockwise, andhas an oppositely wound coil 7 on an iron core 9, tending to force themotor in a. clockwise direction, both direction of force being indicated by arrows appropriately placed on the sides of the windings forpurposes of clarity. The motor armatures are housed within a tube 10,which is extended to form the enlarged housing 11, within which latteris mounted a reduction gearing of any desired sort, as preferably atrain of spur gears (not shown), sufficient to transform the high speedof the motor into the slow speed of a shaft 12, extending from the gearhousing 11. This motor as shown is on the market in this general designwith drive shaft speed of 1 R. P. M. more or less as may be required. Inthis description, it may be assumed that the speed of shaft 12 is 1 R.P. however, the speed of operation is unimportant although certain shaftspeeds may prove more satisfactory in practice than others for certainapplications. This particular motor as shown can be operated clockwiseor anti-clockwise at will, by sending current forming part througheither coil 6 or coil 7. In this description as noted, it will beassumed that the passing of current through coil 6, will result in acounter clockwise movement of shaft 12 as indicated by the arrow on theside of coil 6, while passing current through coil 7 will result in a.clockwise movement of shaft 12, as indicated by the arrow on coil 7.

The shaft 12 carries a disc 13 which is held by friction on the shaft bymeans of the spring 14 and the nut 15. On account of this friction thedisc 13 will turn with the shaft 12, as long as it is free to move.However, the movement of the disc with the shaft is restricted andlimited in clockwise direction by the suitably supported mechanical stop16 being engaged or abutted by a notch, shoulder, or ear 17 on the disc13. In the counter clockwise direction, its movement is restricted bythe mechanical stop 18 being engaged by a corresponding shoulder ornotch 19 on the disc 13. Two glass bulbs or tubes 20 and 21,respectively, are clamped to the disc 13, preferably toward the upper ortop position thereof, with their longitudinal axes out of parallelism oralignment.

These two fully enclosed glass bulbs contain each' a small amount ofmercury. Four electric contacts, two in each end, extend from the insideof each bulb, and bear reference characters respec-' tively from 22 to28 inclusive, and of which contact 25 is a double contact having a legin each of the two bulbs 20 and 21. f

The outer periphery of the disc, preferably the lower half thereof,between the ears or shoulders 17 and 19, has a contour formed of arcsdescribed about the axis of shaft 12 and the axis of the disc, but ondifferent radii. Thus the right hand side of the disc as shown in thedrawing has a cam surface 29 extending from ear 17 to almost thevertical diameter of the disc in the position shown in Fig.1, of a smallradius, while the left hand side of the disc hasa cam surface 30extending from ear 19 to almost the termination of cam surface 29oflarger radius, while the small step or shoulder 36 formed in thecenter of the disc between the ends of cam surfaces 29 and 30 isdescribed on a radius representing, preferably one half of the sum ofthe radii of surfaces 29 and 30. If the disc is disposed as shown inFig. 1, the step or shoulder 36 will be disposed with the verticaldiameter passing through the surface 36.

The insulated block 31 serves as a support for the three flexiblecontact arms 32, 33, and 34. The mechanical arrangement of thesecontacts in relation to the disc 13 is such that the cam 35 on contact33 slides on the bottom surface of disc 13. When the disc 13 is in themid-position as shown on the drawing, Fig. 1, no contact is made by 33with either 32 or 34. If disc 13 is moved clockwise the cam 35 drops off36 and due to its spring tension it raises up and makes contact with 34.If the disc 13 is moved counter clockwise from its center position thecam 35 will be forced down as it passes under the section 30 of the discand make contact with contact 32. In Figs. 2 and 3 are shown theposition of the contacts 32, 33 and 34 in the extreme left and rightpositions.

In Fig. 1, 3'7, 38 and 39 designate, respectively, three electric lightswhich may be of different colors, say 37 is green and stands for lowtemperature or negative condition, 38 is white and stands for righttemperature or neutral or normal condition, and 39 stands for red andmeans too high temperature or positive condition.

III

These three lights enable an operator to manually make the necessarymanipulation of valves or other regulating devicesuin order to try tomaintain the proper temperature or normal conditionwith thewhite lightburning. If automatic control is desired the current that lights thethree lights respectively can be used to manipulate valves, dampers, orother devices thechanically, thus eliminating the human element. Thelights will be designated broadly, therefore, as electric devices.

The glass bulbs 20 and 21 as will be noticed are so arranged that whencam 35 on contact 33 rests onnotch or step 36, the globule of mercury ineach bulb lies in that end of each bulb, that meet in the center inthisposition owing to the angular divergence of twotubes. It will be noticedthat a metallic connection is completed from contact 24 through mercuryin bulb 2-1 to contact. 25 from contact 25 to mercury in bulb 20 tocontact 26. If disc 13 is tilted counterclockwise, the mercury in bothbulbs will take the position as shown in Fig. 2. It will be noticed thatthe mercury in bulb 21 remains in the same position as shown in Fig. 1,but the. mercury in bulb 20, due tothe tilting of disc 13, shifts to theother end of the bulb, thereby opening the metallic connection between24 and 26, but establishing a new connection between 27 and 28. In Fig.3, the disc 13 is tilted clockwise and in this case the mercury in bulb21 shifts and opens the connection from 24 to 26 whereas it makes aconnection between 22 and 23, thus the three different positions of thedisc 13; left tilted position Fig. 2, mid-position Fig. 1 and righttilted Fig. 3, each closes a separate set of contacts and automaticallybreaks anyone 'of the two other connections that were closed in the 1previous position. The angular relation between the two bulbs 20 and 21is generally such (as shown) that only one of these contacts can be madeand one circuit completed at any one time, although there may beoccasions when the bulbs may have to be so mounted in relation to eachother that the contacts and flow of current through each circuit overlapmore or less.

For certain purposes it might be desired to l have the contacts mountedin a single tube instead of a pair of tubes, in which event a tube likethat shown at 21' in Fig. 4 mightbe used. The operation is as follows:

The position in which the apparatus is shown in Fig. 1 is themid-position in general called the neutral or normal position where" thetemperature or condition is as desired, that is when the instrument arm3 does not make contact at either 4 or 5. The light or control circuit,therefore,

is as follows: from line 40 current will pass through wire 41 to wire 42to contact 24, through mercury in bulb 21 to contact 25, through mercuryin bulb 21 to contact 26 to wire 43, to lamp or electric device 38, towire 44, to wire 46 and back tothe other side of the line and the lamp'or device 38 will burn or function indicating that the temperature orcondition where thermostat or responsive indicator 1 is located iswithin the desired limit.

If new the temperature or condition, where thermost or indicator 1 islocated, drops below the desired limit pointer 3 will swing over andimake contact with contact 4. Thisaction estab lishes a circuit asfollows: From line 40 through. wire 48, magnet coil 6, wire 49, wire 50,contact 4, pointer 3, thermostat 1, and wire 51 back to the other line47. This circuit through coil 6 starts the motor operating incounter-clockwise direction. Due to the friction between shaft 12 anddisc 13 the disc turns with the shaft until the notch 19 engages stop 18and the motor continues to turn so long as current continues to passthrough coil 6, however, the disc remains stationary. While thisoperation takes place two things happen, first the tilted bulbs 20 and21 take the position shown in Fig. 2 and as explained above the circuitthrough 24, bulb 21 to double contact 25, to 26, is .broken andconsequently the white light 38 goes out, but a circuit is formed by themercury in bulb 20 between wire 27 and 28, therefore following wiringdiagram on Fig. 1 current will pass from line 40 to wire 41 to contact27 through mercury in bulb 20 to contact 28, through wire 52, throughlight or device 37 wire 53, through wire 44 and 46 back to the otherline 47 and light or device 37 will burn or function indicating that thetemperature or condition where thermostat or indicator 1 is located islow or negative. The other condition that changes by the anti-clockwisemovement of the disc 13, while contact is made by pointer 3 to contact 4and, as explained above, coil6 is energized, is that cam 35 is forceddownward by the high section 30 of the disc 1-3. By this action acontact is made between 32 and 33 as shown in Fig. 2. Assuming thisconnection being made while looking at wiring diagram on Fig. l, thefollowing circuit of fractional power or less current strength is closedor established: from line 47 to wire 48, 54, through coil 7, wire 55,56, 57, contact 32,, contact-33, wire 58,

resistor 59, wire 60, back to' other line 47; This current passingthrough coil 7 tends to oppose the movement in anti-clockwise directionof the shaft 12, but due to the resistance 59 in this circuit the forceof magnet coil 6 is stronger and the coils 6 and 7 and the resistance 60are so proportioned that regardless of the opposing force from magnet 7to the shaft 12, the motor will continue to operate in an anti-clockwisedirectionso long as current of full strength passes through coil 6. If,however, now it is assumed that due to the green light 37 being litmanual adjustment is made to raise the temperature surroundingthermostat l or automatic devices are actuated to effect the same end,and therefore pointer 3 ultimately assumes a position away from contact4. From the foregoing this break 125 between pointer 3 and contact 4cuts the current off to coil 6. This leaves the above described opposingfractional current or circuit of less ourrent strength through coil '7free to operate the again has been brought back to normal. If new thetemperature where the thermostat is located goes up, or the conditionbecomes posi tive, the movementof the pointer 3 towards the right willeventually make contact with contact 5 and thereby complete or establisha circuit from line 4'7 to wire 51, connection 2, thermostat 1, pointer3, contact 5, wire 56, 55, coil .7, wires 54 and 48 back to the otherside of the line 40. The

motor will now operate the shaft 12 and disc 13 in clockwise directionuntil notch 1'1 on disc 13 positive.

abuts stop 16, when the disc stops moving shaft 12 may continue tooperate so long as contact is made between pointer 3 and contact 5, orso long as the temperature is high or condition positive. The disc 13will then be in position as ,shown in Fig. 3, with the mercury in bulb21 breaking the circuit between contact 24 and 26 and light 38, butclosing a circuit through contact 22, the mercury and contact 23,thereby establishing the following circuit: from line 40 to wire 41, 42,contact 22, mercury in bulbs 1, contact 23, wire 61, lamp 39, wire 46,and back to the other side of the line at 40, thereby lighting up lamp39 indicating that the temperature is high or the condition positive.

The cam 35 will slide up on surface 29 on disc 13 and on account of itsspring tension make contact with contact 34 as shown in Fig. 3. Thiswill close a fractional circuit or one of less current strength fromline 4'7 to wire 60, resistor 59, wire 58, contact 33, contact 34, wire62, 50, 49, through coil 6, and wire 48, back to other line 40. Thiscurrent through coil 6 will now oppose the clockwise operation ofithemotor but cannot stop it, due to the reduction of strength by passingresistor 59, however, the minute the temperature or condition changes tobreak. the circuit at the thermostat, between pointer 3 and contact 5disrupting the circuit through coil 7, the current through resistor 59and coil'd will start the motor in anti-clockwise direction until thedisc 13 has been moved back to its mid-- position, where cam 35 isforced up on notch 36, thereby breaking the contactv betweenv 34 and 33which disrupts the circuit passing through coil 6, hence the motor stopsagain in the midposition or neutral position with all circuits brokenexcept the circuit from line so to wire a l, contact 24, mercury in bulb21, contact 25, rnercury in bulb 20, contact 26, wire 43, through lamp38, wire id, 46, s7 and back to the other line leaving the light 38burning to indicate that the temperature or condition at the thermostatl is'within the limits for which the thermostat or indicator isadjusted.

It will be obvious that the voltage of the lines supplying the circuitsthrough lamps or electric devices 37, 38 and 39, may readily be muchhigh er than that necessary to secure the operation of the reversiblemotor, although for purposes of illustration only all circuits are shownas arising from a common line. r

The above described motor relay is but one oi the applications andmodifications of my invention, particularly designed for use withcontact measuring gauges or condition responsive devices where it isessential to arrange to do something in any one of the three cases whenthe temperature is low or condition negative when it is normal and whenit is high or the condition is It prevents chattering action of thecircuits it controls through its mercury contacts because the flickeringof the thermostat con tacts only makes the disc oscillate minutely backand forth without being able to influence the position of the mercury inthe bulbs before a firm make or break is established on or by. the instrument gauge.

In the above described design of my invention the small amount of thecurrent required by the motor coils 6 and 7 must be made and broken bythe contacts on the thermostat, however, this current can be made verysmall and most control instrument contacts can withstand the breaking ofthis faint current.

I claim as my invention:

1. In a motor operated relay for establishing a plurality of circuitsindependent of but in predetermined relation to the relative conditionsin the operating circuit, comprising a motor having two opposite fields,means establishing a circuit through one field while the other field isnot energized to drive the motor in one direction, means establishing acircuit through the lastmentioned field while the first mentioned fieldis not energized to drive the motor in the opposite direction, meansestablishing circuits in both fields simultaneously, and meansforvarying the current strength of one circuit during the simultaneousestablishment to cause one circuit to overpower the other to turn themotor against the urge of one circuit, and means selectivelyestablishing a plurality of secondary circuits in response to therotations of said motor.

2. In combination, a condition responsive contact maker, a reversiblemotor having two opposing fields, means establishing circuitsselectively by the contact maker through the respective opposing fieldsof said motor to cause rotation of the motor, and means operablepursuant to the opening of the selected circuit to maintain a circuitthrough the other of the respective fields to cause a desired oppositerotation of said motor and means selectively establishing a plurality ofsecondary circuits in response to the rotations of said motor. I

3. In a motor operated relay for establishing a plurality of circuitsindependent of, but in predetermined relation to the relative conditionsin the operating circuit, comprising a reversible motor having a pair ofopposed fields, a contact maker, means for establishing a circuitthrough a selected field to cause rotation of the motor in a desireddirection through operation of the contact maker, and means operablesubsequent to. the establishment of said circuit to establish a circuitthrough the other previously unselected field of said motor but of lesscurrent strength than the first circuit, the said last mentioned meansbeing so arranged as to maintain the second mentioned circuit after thefirst circuit is broken to cause the motor to operate in the oppositedirection for a desired extent and means selectively establishing aplurality of secondary circuits in response to the rotations of saidmotor.

4. In combination a two way circuit maker having a neutral position, areversible motor having two opposing fields, apivoted member driven bythe motor through a partial rotation only, a two way circuit makerhaving a neutral position,

which circuit maker is responsive to the position of the pivotedmember,- means establishing a full current circuit through the firstmentioned circuit maker selectively through one field of the motor, andmeans establishing a circuit of less current strength through the otherfield of the motor through the second mentioned circuit maker. 4

5. In a motor driven relay for establishing a plurality of circuitsindependent of, but in predetermined relation to the relative conditionsin the operating circuit, comprising a circuit controller selectivelycontrolling a plurality of secondary circuits, a reversible motoroperatively associated with the circuit controller, the circuitcontroller having a mid-position, a condition responsive circuit maker,means arranged to establish a primary driving circuit selectivelythrough the motor upon the operation of the circuit maker to move thecircuit controller from mid-position in a selected direction, and meansto establish an opposite primary driving circuit, in said motoreffective upon the opening of said circuitmaker to reverse said motor toreturn the circuit controller to its mid-position.

6. In a motor operated relay for establishin a plurality of circuitsindependent of-;;but1; inpre determined relation-to the relative'conditionsin the operating circuit, comprising a'reversingmotor havingtwo opposite fields,=:meansa'establish-..-' ing a full current circuitin .one fieldiandmeans establishing a circuit of weakercurrent strength.

cuit maker, having a neutral positionin'which no contact is made, areversible motorhavin'g two opposing fields, means having a neutralposition and two secondary positions and being in drivenrelation to saidmotor, connections, and a power source, a circuit'maker controlled bysaid means, the arrangement being such that the first mentioned circuitmaker establishes circuits in, one field of the motor such as willactuate same in a desired direction to move said means from its neutralposition to a secondary position, the connections and said secondmentioned circuit maker also so arranged that upon the disruption of thecircuit in the motor through the opening of the first mentioned circuitmaker to neutral position another circuit functions in the other fieldof themotor to operate the motor in the opposite direction to returnsaid means to neutral position.

8. In combination in a motor operated relay, a condition responsivecircuit maker, a reversible motor, a support, means connecting thesupport with the motor for oscillation in response to rotation of themotor, a circuit maker carried by the support, a cam switch operable bythesupport, a source of current, and connections connecting the sourceof current to the condition responsive circuit maker and to therespective fields of the motor, so as to establish driving circuitstherein, connections from the source of current through the cam switchto selectively establish circuits in the respective fields of the motorand said last mentioned circuits being efiective to reversely drive themotor when. the first mentioned driving circuits are broken.

9. In a motor operated relay, a reversible motor, a shaft driventhereby, a disc frictionally driven by the shaft, ears on the disc,stops in position to be abutted by the respective ears to limit themovement of the disc, a cam surface on the edge of the disc, a camswitch having contacts and having wiping engagement with the cam surfaceof the disc and selectively contacting opposite contacts as the discoscillates, a condition responsive circuit maker, connections to asource of current and the cam switch, and connections from the resistorand the cam switch to the fields oi the motor, the cam switch operativeto energize the opposite field of the motor pursuant to the closing ofthe initial driving circuit by the condition responsive circuit makerand which circuits through the resistor are operative to reverselyresponsive circuits 10. In1a motor operated-relay, a'motor having twoopposite fields and a device having alimited i oscillation iniresponseto running of the motor in either' directi n, means for selectivelyclosing a circuit; through either of the two fields according tothe'direction in which it is desired to have the device oscillate, a twoposition switch having a neutral non-contacting position inoperativereladrive the. motor upon opening otthe condition tion to the device andarranged selectively to es-.-

tablish a circuit of less current strength through the other field ofthe motor which selectionis dependent upon the direction of oscillationof said device from the neutral position, and said switch arranged tomaintain the last mentioned circuit after the first mentioned circuit isbroken to cause the'motor to run in the opposite direction to returnsaid device to neutral position.

11. In a motor. operated relay, a condition responsive circuit makermovable between .two contacts, a reversingmotor, switch mechanismselectively-controlling a plurality of secondary circuits, and arrangedin operative association with the motor, means operable when the circuitmaker engages one contact to establish a full current circuit in themotor'urging it in one direction, and thus causing switch mechanism tofunction to close one of said secondary circuits, means operable uponrotation of the motor to close or establish a circuit of less currentstrength through the motor in the opposite direction but insuiiicient tobalance the first mentioned-circuit in the motor, and said meansoperable subsequent to the disengagement from the contact of thecondition responsive circuit maker to cause the motor to run oppositelyand said means automatically actuated to open said less current circuitof less current strength after a predetermined interval, and" saidswitch mechanism so arranged as to open the first of the severalsecondary circuits and to close another in synchronism with the saidinterval.

12. A motor operated relay "comprising in combination three electricaldevices arranged for energization respectively in accordance withconditions indicated by a condition responsive circuit maker, acondition responsive circuit maker having two contacts and an offposition, switch mechanism arranged selectively to establish circuits inthe respective devices, movable means arranged for three positions, theswitch mechanism operatively associated with the said means andautomatically operable according to the position of said means, areversing motor, means operatively associating the movable means and themotor whereby rotation of the motor determines the position of saidmeans, connections arranged with the several parts and so arranged thatengagement of either contact by the circuit maker establishes a fullcurrent circuit in the appropriate side of the motor which will cause itto rotate in the direction proper to actuate said movable means to aposition such as to actuate the switch mechanism to close theappropriate secondary circuit to the appropriate device, andthe contactto caus an opposite rotation oi. said motor to move said movable meansto the appropriate position to energize the switch mechacontactestablishes nism to establish the appropriate secondary circuit throughanother electrical device.

13. In a motor operated relay, a reversible m0- tor, a disc frictionallydriven thereby, the periphery of the disc having surfaces of threedifferent radii, a pair of stationary contacts, a

spring contact between the contacts tending to move toward one of saidstationarycontacts, means on the spring contact in engagement with theperiphery of the disc and engaging one or the other or neither of thecontacts according to the portion of the surface with which it engages,a circuit maker establishing a full circuit through one portion of themotor to urge the motor in one direction, the disc movable with themotor until the spring contact engages an appropriate stationarycontact, a resistor in series with the spring contact and the connectorsbeing such that such engagement of the stationary a circuit of lesscurrent strength through the other half of the motor to urge the motorin the opposite direction the ex-' rent strength of the motor is reducedto approximately one-half but not any more than to retain suflicientstrength to function the motor and the contact introducing current tothe motor through the opposite field of full current strength so thatthe circuit of the half current strength is overpowered and motion takesplace in the opposite direction as long as this full current strengthfield current is maintained, and so arranged that when this fullstrength current through the opposite field is eliminated thecurrentthrough the opposing fields of the low current strength willimmediately start to move the device in the opposite direction inaccordance with the desiredlimitations due to construction.

15. In a motor operated relay in combination, means establishing twoprimary operating circuits, means establishing three operated secondarycircuit conditions, means operatively associated with the primarycircuits, means to establish a predetermined secondary circuit conditionwhen one of the primary circuits is closed, said last mentioned meansarranged to establish another predetermined secondary circuit conditionwhen the other of the said primary circuits is closed means establishingopposing primary circarrying member, further means for.

cuits effective upon the disruption of an associated primary circuit,and said last mentioned means arranged for predetermined altering of therespective secondary circuit condition when the corresponding primarycircuit is broken.

CHRISTIAN WILHJELM.

